I just want to pass on that I've found the Precision grip WERA 3.5mm 118012 screwdriver to be the perfect form to remove Slide-Plate Screws without damaging them, from the Model !0.
Unlike many other screwdrivers, the WERA slotted tool has a thin but strong long blade, thin enough to fit screw slots well and a shaft long enough to give some leverage.
The top, spin feature of the tool moves well and the unique handle gives a choice of griping styles.
Instead of grinding on or down another tool, you'll do well with this one, reasonably priced tool, just shop around on Amazon or eBay for the best free shipping/tool price.
No getting anything for promoting this tool line, just thought others might want to check it out.
By-the-way, I also have this sized tool in Wiha Drivers, but I find the WERA a better fit.
Cheers.